Drying rack base



FIG. 1 is a perspective view of the drying rack base;

FIG. 2 is a top side view of the drying rack base;

FIG. 3 is a bottom side view of the drying rack base;

FIG. 4 is a front side view of the drying rack base;

FIG. 5 is a rear side view of the drying rack base;

FIG. 6 is a side view of the drying rack base; and,

FIG. 7 is a side view of the drying rack base that is opposite the side illustrated in FIG. 6.

The broken line showing of structure is for illustrative purposes only, and forms no part of the claimed design. 

CLAIM The ornamental design for a drying rack base, as shown and described in the Figures. 